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4.11.proceding sibling
4.11.1.First subject preceding Java is
4.11.2.if test="position() = 1 or zip!=preceding-sibling::address[1]/zip"
4.11.3.if test="not(preceding-sibling::address[zip=$lastZip])"
4.11.4.preceding-sibling axis includes those nodes that are in the preceding axis and that also share a parent node with the context node.